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00:00:00">2019-03-08</time><span class="post-meta-separator">|</span><i class="fas fa-history fa-fw post-meta-icon"></i><span class="post-meta-label">更新于</span><time class="post-meta-date-updated" datetime="2022-01-23T11:55:35.806Z" title="更新于 2022-01-23 19:55:35">2022-01-23</time></span><span class="post-meta-categories"><span class="post-meta-separator">|</span><i class="fas fa-inbox fa-fw post-meta-icon"></i><a class="post-meta-categories" href="/categories/JavaScript/">JavaScript</a></span></div><div class="meta-secondline"><span class="post-meta-separator">|</span><span class="post-meta-pv-cv" id="" data-flag-title="八、Math和Date"><i class="far fa-eye fa-fw post-meta-icon"></i><span class="post-meta-label">阅读量:</span><span id="busuanzi_value_page_pv"></span></span></div></div></div></header><main class="layout" id="content-inner"><div id="post"><article class="post-content" id="article-container"><h1 id="Math-和-Date"><a href="#Math-和-Date" class="headerlink" title="Math 和 Date"></a>Math 和 Date</h1><ul>
<li>Math 是 js 的一个内置对象，提供了一堆的方法帮助我们操作 <strong>数字</strong></li>
<li>Date 是 js 的一个内置对象，提供了一堆的方法帮助我们操作 <strong>时间</strong></li>
</ul>
<h2 id="Math"><a href="#Math" class="headerlink" title="Math"></a>Math</h2><ul>
<li><code>random</code>、<code>round</code>、<code>abs</code>、<code>ceil</code>、<code>floor</code>、<code>max</code>、<code>min</code>、<code>PI</code></li>
</ul>
<ol>
<li><p><code>Math.random()</code>，用来生成一个<code>0 ~ 1</code>之间的随机数，生成的数字包含 0 ，但是不包含 1</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> num = <span class="built_in">Math</span>.random();</span><br><span class="line"><span class="built_in">console</span>.log(num); <span class="comment">// 得到一个随机数</span></span><br><span class="line"></span><br><span class="line"><span class="comment">/* 应用场景：随机点名 */</span></span><br><span class="line"><span class="keyword">var</span> names = [</span><br><span class="line">  <span class="string">&quot;娄豪杰&quot;</span>,</span><br><span class="line">  <span class="string">&quot;温亚帅&quot;</span>,</span><br><span class="line">  <span class="string">&quot;窦全磊&quot;</span>,</span><br><span class="line">  <span class="string">&quot;老许&quot;</span>,</span><br><span class="line">  <span class="string">&quot;刘旭&quot;</span>,</span><br><span class="line">  <span class="string">&quot;殷逸&quot;</span>,</span><br><span class="line">  <span class="string">&quot;张朗&quot;</span>,</span><br><span class="line">  <span class="string">&quot;罗慧&quot;</span>,</span><br><span class="line">];</span><br><span class="line"><span class="keyword">var</span> timer = <span class="built_in">setInterval</span>(<span class="function">() =&gt;</span> &#123;</span><br><span class="line">  <span class="keyword">let</span> index = <span class="built_in">Math</span>.floor(<span class="built_in">Math</span>.random() * names.length);</span><br><span class="line">  <span class="comment">// console.log(names[index])</span></span><br><span class="line">  <span class="keyword">if</span> (names[index] === <span class="string">&quot;浩瀚&quot;</span>) &#123;</span><br><span class="line">    <span class="built_in">console</span>.log(<span class="string">`<span class="subst">$&#123;names[index]&#125;</span>：我要请大家吃饭！！！`</span>);</span><br><span class="line">    <span class="built_in">clearInterval</span>(timer);</span><br><span class="line">  &#125;</span><br><span class="line">&#125;, <span class="number">500</span>);</span><br></pre></td></tr></table></figure></li>
<li><p><code>Math.round()</code>，四舍五入</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> num1 = <span class="number">4.4999</span>;</span><br><span class="line"><span class="keyword">let</span> num2 = <span class="number">4.5</span>;</span><br><span class="line"><span class="built_in">console</span>.log(<span class="built_in">Math</span>.round(num1)); <span class="comment">// 4</span></span><br><span class="line"><span class="built_in">console</span>.log(<span class="built_in">Math</span>.round(num2)); <span class="comment">// 5</span></span><br></pre></td></tr></table></figure></li>
<li><p><code>Math.abs</code>，绝对值</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> num = -<span class="number">10</span>;</span><br><span class="line"><span class="built_in">console</span>.log(math.abs(num)); <span class="comment">// 10</span></span><br></pre></td></tr></table></figure></li>
<li><p><code>Math.ceil</code>，是将一个小数 <strong>向上取整</strong> 得到的整数</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> num = <span class="number">10.1</span>;</span><br><span class="line"><span class="built_in">console</span>.log(<span class="built_in">Math</span>.ceil(num)); <span class="comment">// 11</span></span><br></pre></td></tr></table></figure></li>
<li><p><code>Math.floor</code>，是将一个小数 <strong>向下取整</strong> 的到的整数</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> num = <span class="number">10.1</span>;</span><br><span class="line"><span class="built_in">console</span>.log(<span class="built_in">Math</span>.floor(num)); <span class="comment">// 10</span></span><br></pre></td></tr></table></figure></li>
<li><p><code>Math.max</code>，得到的是你传入的几个数字之中 <strong>最大</strong> 的那个数字</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> str = <span class="string">&quot;1, 2, 3, 4, 5&quot;</span>;</span><br><span class="line"><span class="built_in">console</span>.log(<span class="built_in">Math</span>.max(str)); <span class="comment">// 5</span></span><br></pre></td></tr></table></figure></li>
<li><p><code>Math.min</code>，得到的是你传入的几个数字之中 <strong>最小</strong> 的那个数字</p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line">var str &#x3D; &quot;1, 2, 3, 4, 5&quot;</span><br><span class="line">console.log(Math.min(str))	&#x2F;&#x2F; 1</span><br></pre></td></tr></table></figure></li>
<li><p><code>Math.PI</code>,得到的是 <code>π</code> 的值，也就是 <code>3.1415936...</code></p>
<figure class="highlight plain"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line">var num &#x3D; Math.PI</span><br><span class="line">console.log(num); &#x2F;&#x2F; 3.141592653589793</span><br><span class="line">&#x2F;&#x2F; 因为计算机的计算精度问题，只能得到小数点后 15 位</span><br></pre></td></tr></table></figure>
<h2 id="Date"><a href="#Date" class="headerlink" title="Date"></a>Date</h2></li>
</ol>
<ul>
<li><code>js</code> 提供的内置构造函数，专门用来获取时间的</li>
</ul>
<ol>
<li><p>测试程序执行了多久</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> start = <span class="built_in">Date</span>.now(); <span class="comment">// 时间戳</span></span><br><span class="line"><span class="keyword">for</span> (<span class="keyword">let</span> i = <span class="number">0</span>; i &lt; <span class="number">200000000</span>; i++) &#123;</span><br><span class="line">  <span class="built_in">console</span>.log(i);</span><br><span class="line">&#125;</span><br><span class="line"><span class="keyword">var</span> end = <span class="built_in">Date</span>.now();</span><br><span class="line"><span class="built_in">console</span>.log((end - start) / <span class="number">1000</span> + <span class="string">&quot;秒&quot;</span>);</span><br></pre></td></tr></table></figure></li>
<li><p>日期对象转为时间戳</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> date = <span class="keyword">new</span> <span class="built_in">Date</span>();</span><br><span class="line"><span class="built_in">console</span>.log(date * <span class="number">1</span>); <span class="comment">// 方式一</span></span><br><span class="line"><span class="built_in">console</span>.log(<span class="built_in">Number</span>(date)); <span class="comment">// 方式二</span></span><br></pre></td></tr></table></figure></li>
<li><p>时间戳转为日期对象</p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">var</span> timestamp = <span class="number">1616372410777</span>;</span><br><span class="line"><span class="built_in">console</span>.log(<span class="keyword">new</span> <span class="built_in">Date</span>(timestamp)); <span class="comment">// Mon Mar 22 2021 08:20:10 GMT+0800 (中国标准时间)</span></span><br></pre></td></tr></table></figure></li>
<li><p><strong>获取当前时间并且格式化</strong></p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">let</span> date = <span class="keyword">new</span> <span class="built_in">Date</span>();</span><br><span class="line"><span class="keyword">let</span> year = date.getFullYear(),</span><br><span class="line">  month = date.getMonth() + <span class="number">1</span>,</span><br><span class="line">  day = date.getDate(),</span><br><span class="line">  hour = date.getHours(),</span><br><span class="line">  minute = date.getMinutes(),</span><br><span class="line">  second = date.getSeconds();</span><br><span class="line">month &lt; <span class="number">10</span> ? (month = <span class="string">&quot;0&quot;</span> + month) : month;</span><br><span class="line">day &lt; <span class="number">10</span> ? (day = <span class="string">&quot;0&quot;</span> + day) : day;</span><br><span class="line">hour &lt; <span class="number">10</span> ? (hour = <span class="string">&quot;0&quot;</span> + hour) : hour;</span><br><span class="line">minute &lt; <span class="number">10</span> ? (minute = <span class="string">&quot;0&quot;</span> + minute) : minute;</span><br><span class="line">second &lt; <span class="number">10</span> ? (second = <span class="string">&quot;0&quot;</span> + second) : second;</span><br><span class="line"><span class="built_in">console</span>.log(<span class="string">`<span class="subst">$&#123;year&#125;</span>-<span class="subst">$&#123;month&#125;</span>-<span class="subst">$&#123;day&#125;</span> <span class="subst">$&#123;hour&#125;</span>:<span class="subst">$&#123;minute&#125;</span>:<span class="subst">$&#123;second&#125;</span>`</span>);</span><br><span class="line"><span class="comment">// 2021-03-22 08:16:00</span></span><br></pre></td></tr></table></figure></li>
<li><p><strong>封装格式化时间函数</strong></p>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br></pre></td><td class="code"><pre><span class="line"><span class="function"><span class="keyword">function</span> <span class="title">dateFormat</span>(<span class="params">date, format = <span class="string">&quot;YYYY-MM-DD HH:mm:ss&quot;</span></span>) </span>&#123;</span><br><span class="line">  <span class="keyword">const</span> config = &#123;</span><br><span class="line">    YYYY: date.getFullYear(),</span><br><span class="line">    MM: date.getMonth() + <span class="number">1</span>,</span><br><span class="line">    DD: date.getDate(),</span><br><span class="line">    HH: date.getHours(),</span><br><span class="line">    mm: date.getMinutes(),</span><br><span class="line">    ss: date.getSeconds(),</span><br><span class="line">  &#125;;</span><br><span class="line">  config.MM &lt; <span class="number">10</span> ? (config.MM = <span class="string">&quot;0&quot;</span> + config.MM) : config.MM;</span><br><span class="line">  config.DD &lt; <span class="number">10</span> ? (config.DD = <span class="string">&quot;0&quot;</span> + config.DD) : config.DD;</span><br><span class="line">  config.HH &lt; <span class="number">10</span> ? (config.HH = <span class="string">&quot;0&quot;</span> + config.HH) : config.HH;</span><br><span class="line">  config.mm &lt; <span class="number">10</span> ? (config.mm = <span class="string">&quot;0&quot;</span> + config.mm) : config.mm;</span><br><span class="line">  config.ss &lt; <span class="number">10</span> ? (config.ss = <span class="string">&quot;0&quot;</span> + config.ss) : config.ss;</span><br><span class="line">  <span class="keyword">for</span> (<span class="keyword">const</span> key <span class="keyword">in</span> config) &#123;</span><br><span class="line">    format = format.replace(key, config[key]);</span><br><span class="line">  &#125;</span><br><span class="line">  <span class="keyword">return</span> format;</span><br><span class="line">&#125;</span><br><span class="line"><span class="comment">// 使用方式</span></span><br><span class="line"><span class="keyword">var</span> date = <span class="keyword">new</span> <span class="built_in">Date</span>();</span><br><span class="line"><span class="built_in">console</span>.log(dateFormat(date, <span class="string">&quot;YYYY-MM-DD HH:mm:ss&quot;</span>));</span><br></pre></td></tr></table></figure></li>
<li><p><code>Monment.js</code>日期处理类库</p>
<ul>
<li>依赖安装方式：npm install moment –save 或者 yarn add moment</li>
</ul>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">/* cdn引入使用方式 */</span></span><br><span class="line">&lt;script src=<span class="string">&quot;https://cdn.bootcdn.net/ajax/libs/moment.js/2.9.0/moment.min.js&quot;</span>&gt;</span><br><span class="line"></span><br><span class="line"><span class="comment">// 获取当前时间</span></span><br><span class="line"><span class="keyword">let</span> curTime = moment().format(<span class="string">&#x27;YYYY-MM-DD HH:mm:ss&#x27;</span>);</span><br><span class="line"><span class="built_in">console</span>.log(curTime)	<span class="comment">// 2021-03-22 12:00:00</span></span><br><span class="line"></span><br><span class="line"><span class="comment">// 传入时间进行格式化处理</span></span><br><span class="line"><span class="keyword">let</span> date = moment(<span class="string">&#x27;1998-05-23 12:00:00&#x27;</span>)</span><br><span class="line"><span class="built_in">console</span>.log(date.format(<span class="string">&#x27;YYYY-MM-DD HH:mm:ss&#x27;</span>))     <span class="comment">// 1998-05-23 12:00:00</span></span><br></pre></td></tr></table></figure>
<h2 id="定时器的使用"><a href="#定时器的使用" class="headerlink" title="定时器的使用"></a>定时器的使用</h2></li>
</ol>
<ul>
<li><p><code>setInterval</code>和<code>setTimeout </code></p>
</li>
<li><p>语法：setInterval（func，time）</p>
<ul>
<li>有两个参数，第一个参数是一个函数，第二个参数是时间间隔，单位是毫秒</li>
<li>每间隔 time 毫秒，会执行一次函数</li>
<li>setInterval 的返回值是一个数字</li>
</ul>
</li>
</ul>
<figure class="highlight javascript"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br></pre></td><td class="code"><pre><span class="line"><span class="comment">// 计时器每1秒执行一次</span></span><br><span class="line"><span class="keyword">let</span> num = <span class="number">0</span>;</span><br><span class="line"><span class="keyword">let</span> timer = <span class="built_in">setInterval</span>(<span class="function"><span class="keyword">function</span> (<span class="params"></span>) </span>&#123;</span><br><span class="line">  <span class="built_in">console</span>.log(<span class="string">&quot;豪杰真帅&quot;</span>);</span><br><span class="line">  num++;</span><br><span class="line">  <span class="keyword">if</span> (num === <span class="number">10</span>) &#123;</span><br><span class="line">    <span class="built_in">clearInterval</span>(timer);</span><br><span class="line">  &#125;</span><br><span class="line">&#125;, <span class="number">1000</span>);</span><br><span class="line"></span><br><span class="line"><span class="comment">// 延时器延迟一秒执行</span></span><br><span class="line"><span class="built_in">setTimeout</span>(<span class="function"><span class="keyword">function</span> (<span class="params"></span>) </span>&#123;</span><br><span class="line">  <span class="built_in">console</span>.log(<span class="string">&quot;豪杰真帅&quot;</span>);</span><br><span class="line">&#125;, <span class="number">1000</span>);</span><br></pre></td></tr></table></figure></article><div class="post-copyright"><div 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Date</span></a><ol class="toc-child"><li class="toc-item toc-level-2"><a class="toc-link" href="#Math"><span class="toc-number">1.1.</span> <span class="toc-text">Math</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#Date"><span class="toc-number">1.2.</span> <span class="toc-text">Date</span></a></li><li class="toc-item toc-level-2"><a class="toc-link" href="#%E5%AE%9A%E6%97%B6%E5%99%A8%E7%9A%84%E4%BD%BF%E7%94%A8"><span class="toc-number">1.3.</span> <span class="toc-text">定时器的使用</span></a></li></ol></li></ol></div></div><div class="card-widget card-recent-post"><div class="item-headline"><i class="fas fa-history"></i><span>最新文章</span></div><div class="aside-list"><div class="aside-list-item"><a class="thumbnail" href="/article/cc11b2b0.html" title="二、JavaScript设计模式【下】"><img 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